340GHz eighth harmonic mixer

Abstract

The invention provides a 340GHz eighth harmonic mixer. The 340GHz eighth harmonic mixer comprises a radio-frequency input waveguide, a radio-frequency waveguide-suspended microstrip transition structure, a diode, a radio-frequency suppressing low-pass filter, a suspended microstrip-microstrip interconnecting structure, an intermediate-frequency filter, a local oscillator waveguide-microstrip transition structure and a local oscillator input waveguide; a radio-frequency signal is input from the radio-frequency input waveguide and coupled and fed into the diode via the radio-frequency waveguide-suspended microstrip transition structure; the intermediate-frequency filter, the local oscillator waveguide-microstrip transition structure and the local oscillator input waveguide are combined to form a local oscillator-intermediate-frequency duplexer; a local oscillator is fed into the diode after orderly passing through the duplexer, the suspended microstrip-microstrip interconnecting structure and the radio-frequency suppressing low-pass filter; the radio-frequency signal and the local oscillator signal are mixed in the diode and a mixed signal is output. According to the 340GHz eighth harmonic mixer, an eighth harmonic mixing form is adopted so that the local frequency is greatly reduced; meanwhile, the size of the mixer is effectively reduced and the manufacturing difficulty and cost are reduced.

Description

technical field [0001] The invention relates to a mixer, in particular to a 340GHz eighth harmonic mixer. Background technique [0002] Terahertz (THz) waves or terahertz (THz) rays were officially named only in the middle and late 1980s. Before that, scientists collectively called them far-infrared rays. Terahertz waves refer to electromagnetic waves with a frequency between 0.1 and 10 THz, which are located between microwaves and infrared rays on the electromagnetic spectrum. Its long-wave band overlaps with millimeter waves (submillimeter waves), and its development mainly relies on electronics science and technology; And its short-wave band overlaps with infrared rays, and its development mainly relies on photonics science and technology. It can be seen that terahertz waves are the transition frequency band from macro-electronics to micro-photonics, and occupy a very special position in the electromagnetic spectrum. However, due to the lack of effective generation and d...

AI Technical Summary

Problems solved by technology

The main circuit is printed on a whole piece of quartz or gallium arsenide substrate, and the filter in the circuit often adopts the simplest form of step impedance transformation. The filter length of this structure is longer, which makes the whole circuit longer; for For this problem, the existing publications use the form of connecting two or more substrates to form an overall circuit to reduce the processing difficulty. Generally, another quartz substrate is used to complete the intermediate frequency filter circuit and then connected to other circuits, or the intermediate frequency filter is directly eliminated. The intermediate frequency signal is drawn out from a single substrate, but due to the limitation of processing technology, the overall circuit often adopts the form of microstrip line, and the loss of microstrip line in the high frequency band has a great influence on the signal, and the latter still has a great influence on the local Vibration and other harmonic suppression problems

At the same time, the use of the above mixers requires a local oscillator signal source with excellent performance working in the terahertz frequency band. However, most of the more mature signal sources are below the W band, and it is difficult to meet the requirements of the terahertz mixer for the local oscillator. , so it is necessary to design a corresponding local oscillator signal generator

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